Re: [PATCH v2 06/17] PCI: dwc: Add IP-core version detection procedure

[Rob Herring]

On Wed, May 04, 2022 at 12:46:27AM +0300, Serge Semin wrote:
> Since DWC PCIe v4.70a the controller version and version type can be read
> from the PORT_LOGIC.PCIE_VERSION_OFF and PORT_LOGIC.PCIE_VERSION_TYPE_OFF
> registers respectively. Seeing the generic code has got version-dependent
> parts let's use these registers to find out the controller version.  The
> detection procedure is executed for both RC and EP modes right after the
> platform-specific initialization. We can't do that earlier since the
> glue-drivers can perform the DBI-related setups there including the bus
> reference clocks activation, without which the CSRs just can't be read.
> 
> Note the CSRs content is zero on the older DWC PCIe controller. In that
> case we have no choice but to rely on the platform setup.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
> 
> ---
> 
> Changelog v2:
> - Move the IP-core version detection procedure call from
>   dw_pcie_ep_init_complete() to dw_pcie_ep_init().
> ---
>  .../pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>  .../pci/controller/dwc/pcie-designware-host.c |  2 ++
>  drivers/pci/controller/dwc/pcie-designware.c  | 24 +++++++++++++++++++
>  drivers/pci/controller/dwc/pcie-designware.h  |  6 +++++
>  4 files changed, 34 insertions(+)

Reviewed-by: Rob Herring <robh@xxxxxxxxxx>